// test_error_handling.c
#include "test_framework.h"
#include "../hisi_l0_mem_pool.h"
#include "test_common.h"
#include "test_registration.h"

/**
 * test_null_pointer_handling - Tests handling of NULL pointer operations
 * 
 * This test verifies:
 * 1. Safe handling of NULL pointer freeing operations
 * 2. System stability when freeing NULL pointers
 * 3. Proper error handling for NULL pointer operations
 * 
 * Tests robustness against NULL pointer operations
 */
static int test_null_pointer_handling(struct seq_file *m)
{
    int passed = 0, total = 0;
    
    // Test NULL pointer freeing
    total++;
    l0_kfree(NULL);  // Should not crash
    TEST_PASS(m, "NULL pointer freeing handled correctly");
    passed++;
    
    // Test NULL page freeing
    total++;
    l0_free_pages(NULL);  // Should not crash
    TEST_PASS(m, "NULL page freeing handled correctly");
    passed++;
    
    TEST_END(m, "NULL pointer handling tests: %d/%d passed", passed, total);
    return (passed == total) ? 0 : -1;
}

/**
 * test_memory_corruption_detection - Tests basic memory integrity
 * 
 * This test verifies:
 * 1. Basic memory accessibility of allocated blocks
 * 2. Ability to write to and read from allocated memory
 * 3. Memory content integrity after writing
 * 
 * Tests memory integrity and error handling capabilities
 */
static int test_memory_corruption_detection(struct seq_file *m)
{
    struct test_context *ctx = get_test_context();
    void *ptr;
    int passed = 0, total = 0;
    unsigned char *data;
    int i;
    bool pattern_valid = true;
    // Access first byte
    volatile unsigned char first_byte;
    // Access last byte
    volatile unsigned char last_byte;
    
    // Allocate memory
    total++;
    ptr = l0_kmalloc(1024, ctx->test_node_id);
    if (!ptr) {
        TEST_FAIL(m, "Could not allocate memory for corruption test");
        return -1;
    }
    
    // Write to allocated memory with a specific pattern
    data = (unsigned char *)ptr;
    for (i = 0; i < 1024; i++) {
        data[i] = i & 0xFF;
    }
    passed++;
    
    // Verify the written pattern
    total++;
    for (i = 0; i < 1024; i++) {
        if (data[i] != (i & 0xFF)) {
            pattern_valid = false;
            break;
        }
    }
    
    if (pattern_valid) {
        TEST_PASS(m, "Memory pattern verification successful");
        passed++;
    } else {
        TEST_FAIL(m, "Memory pattern verification failed at index %d (expected %d, got %d)", 
                  i, i & 0xFF, data[i]);
    }
    
    // Test memory access at boundaries
    total++;
    first_byte = data[0];
    last_byte = data[1023];
    // Verify boundary values
    if (first_byte == 0 && last_byte == 255) {
        TEST_PASS(m, "Boundary memory access test successful");
        passed++;
    } else {
        TEST_FAIL(m, "Boundary memory access test failed (first: %d, last: %d)", 
                  first_byte, last_byte);
    }
    
    l0_kfree(ptr);
    passed++;
    total++;
    
    TEST_END(m, "Memory corruption detection tests: %d/%d passed", passed, total);
    return (passed == total) ? 0 : -1;
}

// Export test cases
static struct test_case test_error_cases[] = {
    {"NULL Pointer Handling", test_null_pointer_handling},
    {"Memory Corruption", test_memory_corruption_detection},
};

DECLARE_TEST_MODULE(error, test_error_cases)